Pumping unit for artificial-silk-spinning machines



Dec. 2, 1930. c w, ws 1,783,439

PUMPING UNIT FOR ARTIFICIAL SILK SPINNING MACHINES Filed March 8, 1929 2 Sheets-Sheet l FIG. I.

WITNESSES I INVEN TOR.-

I Cizaries WLawser;

A TTORNEYS.

54. BY W Dec. 2, 1930. c. w. LAWSER 1,783,439

PUMPING UNIT FOR ARTIFICIAL SILK SPINNING MACHINES Filed March 8, 1929 2 Sheets-Sheet 2 Fja H WITNESSES INVENTOR:

2 z k cmries WLawsez;

a BY W A TIORNEYS.

Patented Dec. 2, 1930.

UNITED STATES PATENT OFFICE CHARLES w. LAWSER, OF BALA, PENNSYLVANIA, ASSIG-NOR TO THE WIGACO MACHINE CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA PUMPING UNIT FOR ARTIFIOIALl-SILK-SPINNING MACHINES Application filed March 8,

This invention relates to pumpin units for delivering fluid cellulose to indivi ual spinnerettes of artificial silk (rayon) spinning machines, and has particular reference to a pumping unit of the multi-piston type with an associated pressure equalizing chamber ordinarily known as a pressure bottle.

In rayon pumping units of the referred to type as heretofore constructed, difficulty was experienced in preventing the cellulose from congealing and hardening in the pressure equalizing chambers (bottles) associated with them and-thus precluding uniform delivery of the fluid cellulose to the spinnerettes and production of yarns of unvarying gage. Under these conditions it was necessary to clean the pressure bottles at ver frequent intervals to the disadvantage o hampering continuous production as a consequence of the machine stoppages entailed.

The purpose of my invention is to overcome the recited drawbacks of previous practice by providing for continuous circulation of the viscose in the pressure bottles to the end that the latter are rendered self-scavenging with avoidance of cloggingand the necessity for frequent cleaning.

How the foregoing and other important advantages can be readily realized in ractice will be manifest from the detailed escription following of the typical embodiment shown in the drawings, wherein Fig. I shows an elevation of my improved pumping unit.

Fig. II is a cross section of the organization taken as indicated by the arrows IIII in Fig. I.

Fig. III is a longitudinal sectional view; and,

Figs. IV and V are diagrammatic views in linear development showing the action of the unit. I

The pumping herein delineated is, generally speaking, of customary design and construction in that it comprises a pump 10 w1th a horizontal cylindric casing 11, and a surmounted pressure equalizing bottle 12 of glass. As shown, the bottle 12 is inverted, and has its mouth end resting upon a gasket 13 of rubber or the like seated in the facial 1929. Serial No. 345,263;

recess of a boss 14 at the top of the pump casing 11, fluid tightness being insured through downward pressure exerted on the bottle 12 by a thumb screw 15. This thumb screw 15 is supported by a bridge piece 16 which is removably engaged beneath the heads of sta rods 17 upstanding from the face of said boss 14. To permit of its being pivotally mounted, the ump casing 11 is provided at opposite sldes with aligned trunnions 18, 19 through which the main intake and discharge ports 20, 21 extend. From Fig. I it will be noted that the trunnions 18, 19 lie in the same plane with the boss 14 and that the latter is pierced as at 22, 23 with provision at an intermediate point circumferentially of a pair of auxiliary efliux and influx ports, said ports leading through the gasket 13 into and out of the pressure bottle 12. As shown, the port 22 is the rotor axis, each of such bores accommodating a piston 30. In the present instance, the outer ends of the pistons 30 are fashioned to spherical configuration as at 31, for fitment into peripheral socket notches 32 of a disk 33, that rotates in contact with the inclined bearing face 34 afforded by the closure head 35 at the opposite end of the pump casing. The disk 33 is held in yielding contact with the inclined bearing surface 34 through pressure exerted by a spring 36 within an axial recess 37 of the rotor 25 said spring acting upon a plunger 38 that bears in turn upon a ball 39 engaged Within acentral socket depression 40 of the disk 33. The free movement of the plunger 38 is limited by a stop rod 41 which extends axially through the rotor 25 and which is subject to regulation by a pair of set screws 42, 43 at the outer end of the stem 26. As a consequence of the described arrangement, the pistons 30 will obviously be continuously reciprocated within the bores 29 as the rotor 25 revolves.

Adjacent their inner ends, the several piston bores 29 are formed with spaced inlets and outlets 45, 46, 'see Figs. III-V, capable of registry respectively in alternation during each revolution of the rotor 25 with correspondingly spaced non-lapping segmental circumferential grooves 47, 48 internally of the pump casing 11. Again referring to Figs. III-V, it will be observed that the groove 47 communicates with the main. intake port 20, and the groove 48 with the auxiliary cfllux port 22 leading into the pressure bottle 12. Still another segmental circumferential groove 49, spaced from the others within the casing 11 and co-aligned with the groove 48, constltutes a path of communication between the main discharge port 21 of the pump 10, and the influx port 23 leading out of the pressure bottle 12.

The operation of the pumping unit is as follows: Let it be assumed that the cooperation between the actuating disk 33 and the inclined bearing surface 34 of the casing head 35 is such that each piston 30 is caused to move downward with passage of the inlet port 45 of the corresponding bore 29 of the rotor 25 along the circumferential groove 47 after the manner of Fig. IV. As a consequence, a charge of the cellulose is drawn into the bore 29 through the main inlet port 20 at the trunnion 18 of the pump casing. With further movement of the rotor 25 in the direction of the arrow in Fig. IV, the inlet 45 of the bore 29 is covered as it passes beyond the end of the groove 47 and along the blank area between the grooves 48, 49. However, soon after departure of the inlet 45 from the groove 47, the outlet 46 isbrought into registry with the groove 48, this occurring just as the movement of the iston 30 is reversed. With advancement o the pistom 30 through its pressure stroke (indicated by the arrow in Fig. V) as the rotor movement proceeds, the previously drawn in charge is expelled from the bore 29 of the rotor 25 through the outlet 46 and into the groove 48, and in turn conducted through the auxiliary port 22 and its tubular extension 24 into the pressure bottle 12. At the same time, a corres onding quantity of the fluid is displaced rom the bottle 12 and forced through the auxiliary influx port 23 and into the third circumferential groove 49 at the interior-of the pump casing 11, for expulsion through the main discharge port 21 of the pump. It is of course to be understood that the same avenues of intercommunication are established incident to the reciprocation of the other pistons 30 during each revolution of the rotor 25, said pistons, by

this concerted action, promoting the steadiness of the fluid delivery as in all pumps of the multi-piston type. Through my inven tion it will however be apparent that a definite circulation is set up within the pressure bottle 12 due to provision of separate inflow and outflow ports 22, 23, for the latter instead of a single port after usual practice in this art heretofore, to the advantage of precluding the possibility of congealing or caking of the cellulose in the pressure bottle 12 and dispensing With the necessity for frequent cleaning of the latter, andmost important of allinsuring a steady flow of the cellulose to the spinnerette supplied by the unit. The described advantageous action is moreover obtained with avoidance of complications and expense in the construction of the pump. Another important advantage inherent to my invention is that the liberal spacing of the grooves 4749,obviates danger of short circuiting between the main inlet and outlet ports 20, 21, and therefore corrects another difliculty characteristic of Viscose pumps of the multi-piston type as heretofore designed.

Having thus described my invention, I claim:

-1. In a pumping unit of the character described, a casing having main intake and discharge ports at circumferentially spaced points, a pair of auxiliary efliux and influx ports at an intermediate point leading into and out of an associated pressure bottle, and at its interior a series of spaced circumferential grooves, and a rotor having a series of piston accommodating bores adapted to govern said ports and grooves so that as a charge of-fluid is drawn in during the suction period of rotor action, and subsequently injected through the auxiliary efiiux port into the ressure bottle, a corresponding quantity 0 the fluid is concurrently displaced from said bottle for delivery through the main discharge port of the pump after circulating through the bottle.

2. In a pumping unit of the character described, a casing having main intake and discharge ports through axially aligned bearing trunnions at opposite sides, a pair of auxiliary efliux and influx ports at an intermediate point leading into and out of an associated pressure bottle, and at its interior a series of spaced circumferential grooves, and a rotor having a series of longitudinal bores with inlets and outlets and reciprocable pistons therein adapted to govern said ports and grooves so that as a charge of fluid is drawn in during the suction period of rotor action, and subsequently injected through the auxiliary efliux port into the pressure bottle, a corresponding quantity of the fluid is concurrently displaced from said bottle for delivery through the main discharge port of the pump after circulating through the bottle.

3. A pumping unit of the character described, comprising a casing havi'ng main intake and discharge ports at circumferentially spaced points, a pair of auxiliary efliux and influx ports at an intermediate point leading into and out of an associated pressure bottle, and at the interior three spaced circumferential grooves; and a rotor having spaced inlets and outlets adapted to register respectively and in alternative sequence with two of the circumferential grooves aforesaid with establishment of communication whereby a charge of fluid is drawn in during thesuction period of the rotor, and subsequently injected during the pressure period into the pressure bottle and a corresponding quantity of the fluid concurrently displaced from said bottle, the displaced fluid being conducted through the third circumferential groove to the main discharge port of the pump after having circulated through the bottle.

4. A pumping unit of the character described, comprising a casing having at opposite sides main intake and discharge ports, a pair of auxiliary efllux and influx ports at an intermediate circumferential point leading into and out of an associated pressure bottle; and a rotor with a plurality of longitudinal bores housing as many reciprocating pistons, each such bore having a pair ofspaced lateral inlets and outlets adapted to register in alternative sequence respectively during the suction and pressure strokes of the pistons with .two correspondingly spaced non-lapping segmental circumferential grooves internally of said casing, the first of said scribed com using a casing having main inintermediate circumferential point leading take and dlscharge ports through axially aligned bearing trunnions at opposite sides, a pair of'auxiliary efliux and influx ports at an into and out of an associated pressure bottle; and a rotor with a plurality of longitudinal bores housing as many reciprocating pistons, each such bore having a pair of spaced lateral inlets and outlets adapted to register in alternative sequence respectively during the suction and pressure strokes of the pistons with two correspondingly spaced non-lapping segmental circumferential grooves internally of the casing, the first of said grooves communicating with the main intake port aforesaid and the second with the auxiliary efliux port leading into the pressure bottle, and a third segmental circumferentlal groove within the casing in spaced relation to 

